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为探求列车运行所引起的桥下地面振动衰减规律，通过一系列现场测试，测得多组在不同车速下的地面加速度记录，对所得加速度记录进行计算处理，得到了各测点的最大加速度值．然后针对各测点的加速度比，运用复合回归方法，得到了列车运行时所引起的桥下地面加速度衰减经验公式
In order to explore the law of attenuation of ground vibration under the bridge caused by train operation, a series of field tests were performed to measure the ground acceleration records of multiple groups at different vehicle speeds. The calculated acceleration records were calculated and the maximum acceleration values . Then, according to the acceleration ratio of each measuring point, the empirical formula of attenuation of ground acceleration under the bridge caused by the train running is obtained by the compound regression method